body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;

  }
  header {
    background: #1b1d2a;
    color: #fff;
    padding: 20px;
  }

  header img {
      width: 250px;
      margin-left: 200px;
  }
  nav {
  padding-left: 220px;
    background: #2f3347;
    display: flex;
    position: relative;
  }
  nav ul {

    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
  }
  nav li {
  position: relative;
  }
  nav a {

    color: #fff;
    padding: 15px 20px;
    display: block;
    text-decoration: none;
    font-weight: bold;
  }
  nav li:hover > a {
    background: #444b66;
  }

  .submenu {
    display: none;
  }

  .has-submenu.open .submenu {
    display: block;
  }



  .submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #2f3347;
    min-width: 250px;
    z-index: 1000;
    flex-direction: column;
  }
  .submenu a {
    padding: 12px 20px;
    font-weight: normal;
  }
  nav li:hover .submenu {
    display: flex;
  }

  .intro,.source-info {
    width: 80%;
  }

  .intro,.source-info, .wwo {
    padding-left: 200px;
  }
  .image-section img {
      width: 100%;

  }

  .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 50px;
  }
  .card {
    border: 1px solid #ddd;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    width: 320px;
    height: 450px;
    display: flex;
    flex-direction: column;
    align-items: center;

  }
  .card-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 40px;
    background-color: #2f3157;
    height: 120px;
    width: 100%;
  }
  .card-header .icon {
    background-color: #2f3157;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px ;
  }

  .card-header img {
    padding-top: 20px;
  }

  .card-header h2 {
    font-size: 18px;
    color: white;
    text-align: center;

  }
  .card p {
    font-size: 15px;
    color: #000;
    background-color: #eae9ee;
    padding: 15px;
    height: 100%;
    margin: 0;
    line-height: 25px;

  }

  .why-choose-us {
    margin-top: 40px;

  }
  .why-choose-us h1, ul {
    margin-left: 200px;
  }

  .why-choose-us ul {
    line-height: 40px;
  }

  .conclusion {
    margin-left: 200px;
    width: 80%;
    line-height: 25px;
  }



  footer {
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 40px;
    background-color: #1d1e30;
    color: white;
    flex-wrap: wrap;
    gap: 40px;
  }

  .leftft {
    flex: 1;
    min-width: 280px;
    margin-left: 150px;


  }

  .rightft {
    margin-left: auto;
    min-width: 350px;
  }

  .leftft img {
    width: 150px;
    margin-bottom: 15px;
  }

  .leftft p {
    margin: 20px 0;
    font-size: 14px;
    width: 80%;
    line-height: 25px;

  }

  .rightft ul {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .rightft li {
    margin-bottom: 8px;
  }

  footer a {
    color: #ffffff;
    text-decoration: none;
  }

  footer a:hover {
    text-decoration: underline;
  }

  @media (max-width: 768px) {
    header img {
      margin: 0;
      width: 150px;
    }

    nav {
      padding: 0;
      flex-direction: column;
    }

    nav ul {
      flex-direction: column;
      width: 100%;
    }



    .intro, .source-info {
        padding-left: 10px;
        line-height: 25px;
        width: 95%;
    }

    .wwo {
        width: 90%;
        margin: 0;
        padding-left: 10px;
    }


    .why-choose-us h1,
    .why-choose-us ul,
    .conclusion {
      padding-left: 25px;
      margin: 0;
      width:90%;
    }

    .conclusion {
        line-height: 30px;
    }

    .container {
      gap: 20px;
    }

    .card {
      width: 90%;
    }

    footer {
      flex-direction: column;
      align-items: center;
      padding: 20px;
    }

    .leftft,
    .rightft {
      margin-left: 0;
      max-width: 100%;
    }

    .leftft p {
      width: 100%;
    }
  }


  @media (max-width: 480px) {
    header img {
      width: 120px;
    }

    nav a {
      padding: 10px;
      font-size: 14px;
    }

    .card {
      height: auto;
    }

    .card-header h2 {
      font-size: 16px;
    }
  }